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Planar antenna
| Details |
Inventors: Aoyagi, Yoshiki; Murakami, Atsushi; Nakada, Mamoru; Ajiki, Mitsunori; Suzuki, Shigeru;
Assignee: Mitsubishi Kasei Corporation (Tokyo, JP)
Primary Examiner: Hille; Rolf
Assistant Examiner: Brown; Peter Toby
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A planar antenna comprising a dielectric layer containing a homopolymer of 3-methylbutene-1 or a copolymer of 3-methylbutene-1 and an alpha-olefin of from 2 to 12 carbon atoms, a polyene or a mixture thereof, a conductor laminated on the whole back surface of said dielectric layer and a circularly polarized radiation microstrip element formed from a metal foil and provided on the other surface of said dielectric layer. |
|
DETAILED DESCRIPTION OF THE INVENTION: The gist of the present invention lies in the use of a dielectric layer containing a homopolymer of 3-methyl- butene-1 or a copolymer of 3-methylbutene-1 and an alphaolefin of from 2 to 12 carbon atoms and/or a polyene as a dielectric layer in a planar antenna comprising the dielectric layer, a conductor laminated on the whole back surface of the dielectric layer and a circularly polarized radiation microstrip element formed from a metal foil and provided on the surface of the dielectric layer.
As the dielectric layer containing a homopolymer of 3-methylbutene-1 or a copolymer of 3-methylbutene-1 and an alpha-olefin of from 2 to 12 carbon atoms and/or a polyene, which is used in the present invention, a single or laminated substance comprising film or sheet of the polymer or copolymer of a thickness of from 20 to 1000 .
mu.
m may be used.
Generally, the thickness of the dielectric layer is in the extent of from 500 to 1000 .
mu.
m.
In the case where the thickness is below 500 .
mu.
m, the gain becomes smaller and on the other hand, in the case where the thickness is over 1000 .
mu.
m, the effective area of the antenna becomes smaller.
Namely, these two cases are unfavorable.
The particularly preferable thickness of the dielectric layer is in the extent of from 750 to 850 .
mu.
m.
Although a homopolymer of 3-methylbutene-1 gives the favorable dielectric characteristics to the planar antenna, it may be possible that the dielectric layer includes a copolymer of 3-methylbutene-1 of not less than 70% by weight, preferably not less than 80 % by weight and an alpha-olefin of from 2 to 12 carbon atoms and/or a polyene of not more than 30% by weight, preferably not more than 20 % by weight from the viewpoint of the moldability of the material.
The homopolymer of 3-methylbutene-1 shows a melting point of from 260 to 310.
degree.
C, a dielectric constant (.
epsilon.
) of from 2.
0 to 2.
2 and a dielectric loss tangent (tan .
delta.
) of from 10.
times.
10-.
sup.
4 to 12.
times.
10
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